JPS5936865B2 - How to make trim - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing trim used for protecting, decorating, and sealing corners and joints of automobiles, furniture, etc., and also used for fixing weather strips. It is.

This type of trim is made of rubber or synthetic resin and has a core material embedded in its main body in order to improve its shape retention.

The trim needs to be able to bend and deform according to the shape of its attachment location, and therefore the core material is required to allow the trim to be deformed. Various core materials have been proposed to meet this demand. The conventional core materials D and E shown in FIGS. 1 and 2 are made by punching out a thin metal plate using a press.The core material D has a large number of strip-like portions 1 connected to each other by a connecting portion 2a at the center in the width direction. The body is connected, and the heartwood E
A large number of strip-like portions 1 are integrally connected at both ends by connecting portions 2b.

These core materials are then covered with a covering material of rubber or synthetic resin, and then bent into a desired cross-sectional shape, such as a U-shape, to obtain a trim. These core materials are easy to manufacture, have good strength, do not deform when covered with a covering material, and have excellent shape retention when a trim is attached. However, since the body is connected by the connecting portion, expansion and contraction in the longitudinal direction is impossible, and flexibility is also limited. The conventional core materials F and G shown in FIGS. 3 and 4 eliminate the drawbacks of the core materials D and E. The core material F shown in FIG. A large number of elongated holes 31 of equal length are provided in the thin plate to form connecting portions 2C on both sides in the width direction of the thin plate, and a groove 4 is provided between the elongated holes 31 and the edge of the thin plate to make it thin so that it can be easily broken by external force. It is something.

After covering the core material F with the covering material, an external force is applied to break the core material F at the groove 4, thereby obtaining a trim in which separated strip-shaped core material pieces are embedded. The core material G shown in FIG. 4 is a strip-shaped thin metal plate in which a large number of elongated holes 32 of equal length are provided in the width direction at predetermined intervals, and narrow connecting portions 2d are formed on both sides of the thin plate in the width direction.

After covering the core material with the covering material, the connecting portion 2d of the core material is removed along with the covering material by cutting, grinding, etc. at the position indicated by the two-dot chain line in the figure, thereby creating a trim in which a large number of separated strip-shaped core material pieces are embedded. can get. Trim using such core material can be expanded and contracted and has good flexibility, but when core material F is used, it is difficult to set the depth of the groove 4, and if the groove 4 is made too deep and thin, Breakage and deformation occur during the coating process of the coating material and when supplying the core material to the coating process, resulting in poor workability.

Furthermore, if the groove 4 is made too shallow, it will be extremely difficult to break the covering material when external force is applied after the covering material is coated. On the other hand, when the core material G is used, a process for removing the connecting portion 2d is required, and there is a lot of wasted material, resulting in high costs.

Further, since the core material is exposed from the end of the trim, there are problems such as rust on the core material and damage to objects when assembling the trim. In addition, in both cases of core material F and G, since the rectangular core material pieces are buried in a divided state, they tend to be misaligned, for example, when trim is attached to a member with a large curvature, the inside of the bend Wrinkles tend to occur in the trim due to the pieces of heartwood overlapping each other. The present invention has been made in view of the above circumstances, and provides a trim that has good shape retention, gives good elasticity and flexibility to the trim, and has a core material embedded within the trim that is held without shifting. The present invention provides a manufacturing method for manufacturing with good workability.

In particular, the present invention is characterized by a core material and a method for manufacturing the same, in which a large number of slits are formed in a strip-shaped thin metal plate at predetermined intervals in its longitudinal direction.

This slit can be provided in the center of the thin metal plate, leaving areas on both sides of the metal plate where no slits are formed, or alternatively, slits can be provided in the center and on both edges, and a slit can be formed between the slit in the center and the slits on both sides. Leave the part where it will not be formed. In addition, the length of the slits is adjusted so that the width of the part where the slits are not formed is narrower in at least every other row than in the other rows. As a result, narrow connecting portions are formed on both sides of the thin metal plate in the width direction at predetermined intervals in the longitudinal direction. Next, this connecting portion is rolled in the longitudinal direction with a roller or the like to elongate the thin metal plate in the longitudinal direction, thereby expanding each of the slits to form a long hole.
In this way, a strip-shaped core material in which a large number of long holes are formed at predetermined intervals can be obtained with good workability.

However, if the core material of the lever is coated with a rubber or synthetic resin covering material and then a bending force is applied to it, the core material will easily break at the narrow parts of the joints on both sides of the core material, which have been thinned by rolling. Ru.

As a result, a plurality of rectangular portions facing each other across the elongated hole are divided into core pieces connected at both ends within the trim. The trim in which the core material pieces divided in this manner are embedded has good extensibility and flexibility. In addition, each core piece has a long hole, and since the inside of the long hole and the area around the core piece is filled with a covering material, even when the trim is attached to a member with a large curvature, the core piece The trim retains its shape well without any misalignment, and wrinkles are less likely to form on the bent inner surface of the trim, giving it a good appearance when installed. Examples will be described below with reference to the drawings.

Embodiment 1 As shown in FIG. 5, long slits 6 and short slits 7 in the width direction are provided alternately in a strip-shaped thin metal plate 5 at predetermined intervals in the longitudinal direction.

These slits can be easily formed by processing the metal thin plate 5 with a slitter roll. The thin metal plate 5 processed in this manner has connecting portions 8 without slits formed in the longitudinal direction on both sides thereof, and the width of these connecting portions becomes narrower at every other slit. Next, both connecting portions 8 are rolled in the longitudinal direction using rolling rolls.

As a result, as shown in FIG. 6, both connecting portions 8 become thinner, the thin metal plate 5 is entirely extended in the longitudinal direction, and the slits 6 and 7 are expanded to form elongated holes 60 and 70. 60
A core material A is obtained in which narrow connecting portions 80 are formed on both sides of the core material A. Next, the core material A thus obtained is wound onto a core material winding drum and supplied to a trim manufacturing process. As shown in FIG. 7, this trim manufacturing process includes the steps of simultaneously extruding the core material A supplied from the core material winding drum H and the rubber covering material supplied from the extruder J using a crosshead J1;
A process of forming a grain pattern on the extruded trim with a grain roll K, a process of passing it through a vulcanization tank L to perform vulcanization, and a process of taking the vulcanized trim with a take-up roll M, followed by a core cutting machine. This process consists of a step of dividing the core material A into a large number of core material pieces using an N, and a step of bending the core material A into a desired cross-sectional shape such as a U-shape using a bending machine P. The core cutting machine N is provided with a plurality of large diameter rolls N1 and small diameter rolls N2, and the trim is stretched between these rolls. These large-diameter rolls are designed to sequentially increase the roll diameter or rotation speed in the direction in which the trim moves, thereby applying a tensile force to the trim, and the trim is folded by the small-diameter rolls. Bending force is applied repeatedly. As a result, the core material A in the trim is broken at the narrow connection portion 80 (FIG. 6). The bending machine P has multiple pairs of rolls Pl, P2, P.
3 are disposed, and the gap between the pair of rolls is sequentially changed into a desired shape such as a U-shape, and finally a trim processed into a predetermined cross-sectional shape is obtained. In addition,
If the covering material is a synthetic resin, no vulcanization step is required.

Further, in trims that do not require a grain pattern, the grain pattern processing step described above is not necessary. As shown in FIG. 8, the trim thus obtained includes a number of core pieces A1 in which a pair of strip-shaped thin plates bent into a U-shape are connected at both ends in the covering material R. is formed, and these core pieces A
, are buried in an array at narrow intervals. Therefore, in the present invention, by rolling both sides of a thin metal plate provided with slits, a core material having elongated holes arranged therein can be produced extremely easily. Since the core material obtained in this way has thin walls on both sides of the elongated hole, it is easy to bend the core material in the core material cutting process after coating with the covering material, and the thin wall portions are arranged at predetermined intervals. Since the width is narrow at this narrow portion, the bending stress is concentrated in this narrow portion, and it can be broken extremely easily and reliably at this portion. The trim in which the core pieces broken and separated in this manner are embedded has excellent elasticity and flexibility.

In addition, the outer periphery of each core piece is filled with sheathing material, and the long holes of the core piece are also filled with sheathing material, so even when trim is attached to a member with a large curvature, there is no misalignment and there is no misalignment. Demonstrates shape retention. Moreover, since the core piece is fixed in position within the sheathing material, if the trim is bent,
Bending] The core pieces do not overlap each other on the inner surface side, and wrinkles and unevenness can be prevented from occurring.

Embodiment 2 In the embodiment shown in FIGS. 9 and 10, long slits 6 and short slits 7 in the width direction are alternately provided in the strip-shaped thin metal plate 5 at predetermined intervals as shown in FIG. Slits 9 are provided on both side edges of the thin plate 5 at the same position as each of these slits.

As a result, connecting portions 8 are formed in the longitudinal direction at opposite ends of the slits 6 and 7 in the center and the slits 9 on both side edges, and the width of the connecting portions 8 becomes narrower at every other row of slits. There is. Next, a portion of the thin plate 5 between the tip of the slit 9 and the tip of the short slit 7 is rolled in the longitudinal direction.

In this case, since there are slits on both sides of the rolling section, the slits widen and the thin plate 5 can be easily stretched. In the thus obtained core material B shown in FIG. 10, the rolled connecting portion 8 becomes thinner, but both side edge portions maintain the original thickness.

Thereafter, a covering material is applied in the same process as in the above embodiment, and the core material is broken at the narrow part 80 between the grooves in the rolled connection part to form a core material piece, which is bent into a U-shaped cross-sectional shape.
A trim is obtained in which a large number of pieces of corewood are embedded.

In the case of this embodiment, in addition to having the same effect as the above embodiment, since both side edges of the core material are kept relatively thick, there is a large curvature on the end side of the core material piece when attaching the trim. Even if the core piece is bent, there is no fear that the end of the core piece will break through the covering material and be exposed.

In this embodiment, the width of the connecting portion was changed by changing the length of the slit 6 at the center, but the lengths of the slits 9 at both side edges may be changed.

Further, the slits 9 on both side edges may be provided every other row with respect to the slit 6 in the center. Furthermore, in both of the above embodiments, the core material was broken at every other row of elongated holes to obtain core material pieces, but the core material may be broken at every second or third row depending on the shape of the trim attachment member, etc. .

As explained above, when manufacturing a trim in which a large number of separated core pieces are buried, a large number of slits in the width direction are provided on both sides of the thin metal plate, leaving a connecting portion continuous in the longitudinal direction, and the width of the connecting portion is reduced. At least every other row of slits is made narrower, both connecting parts are rolled in the longitudinal direction to make them thinner, and the slits are widened to obtain a core material with long holes.After covering this with a covering material, bending force is applied. The core material is divided into core material pieces with long holes, and the entire trim is bent into a predetermined shape to obtain the desired product.The core material can be manufactured with good workability, and the core material can be easily and easily cut into predetermined parts. Can be reliably broken.

The resulting trim has excellent elasticity, flexibility, and shape retention, and is particularly effective when attached to members with large curvature.

[Brief explanation of the drawing]

1 to 4 are partial perspective views of conventional trim core material, FIG. 5 is a partial perspective view of a thin metal sheet for core material used in the practice of the present invention, and FIG. 6 is a partial perspective view of a thin metal sheet manufactured from the thin sheet. A partial perspective view of the core material, FIG. 7 is a schematic diagram showing the trim processing process,
FIG. 8 is a partially cutaway perspective view of the trim in which the core material is embedded, FIG. 9 is a partial perspective view of a thin metal sheet for the core material used in another embodiment of the present invention, and FIG. 10 is a perspective view of a trim made from the thin sheet. It is a partial perspective view of a core material. A, B... Trim core material used in the present invention, A1.
...Trim core material pieces, D, E, F, G...
Core material used in conventional trim, 5...Thin metal plate for core material, 6,7,9...Slit of thin metal plate, 8...Connection part of thin metal plate , 80...
・Narrow connecting part.

Claims (1)

[Claims] 1. When manufacturing trim in which shape-retaining core material is embedded,
A strip-shaped thin metal plate is provided with slits extending in the width direction at predetermined intervals in the longitudinal direction, at the center of the thin metal plate, or at the center and both side edges, and on both sides of the slit in the center. A continuous connecting portion is formed, and the length of the slit is changed so that the width of both connecting portions is narrowed in at least every other row of slits, and both connecting portions that are continuous in the longitudinal direction are rolled to form a metal. By stretching the thin plate in the longitudinal direction, a core material having a large number of elongated holes formed by expanding the slits in the longitudinal direction and thin connecting parts on both sides is obtained, and the core material is made of rubber or synthetic resin. A bending force is applied to the covering material to break the narrow connection part of the core material embedded in the covering material, and a plurality of strip-shaped parts facing each other are formed at both ends of the core material, which are separated from the central elongated hole. A method for producing a trim, which comprises dividing the trim into core pieces connected by unbreakable connecting parts, and bending the trim in which the core pieces are embedded to give a desired cross-sectional shape.